Improvements in the construction of a didactic system for teaching. (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in the construction of a didactic system for teaching, characterized by the fact that inside a housing a drum is housed with a reading head that neatly collects the information recorded on magnetic tape on the back of a card capable of being mounted on said drum, which has printed on the obverse some graphics, visible through a viewfinder, so that an acoustic signal or sound corresponding to the represented graphic is produced, for which the apparatus has an electronic equipment that comprises in lines general, a preamplifier, frequency correction filters and low frequency amplifier, as well as a speaker that transmits the reading made. (Machine-translation by Google Translate, not legally binding)